The best way to get a lot of rain is to have a seed for a water droplet to form on.
The fires of California helped increase the chances of rains for California and other places.
In the record, the Earth was on auto pilot under the guidance of Gaia. No more. The various avatars, golems, and dragons are reshaping the Earth to meet the needs of the human race and the other races that take on human bodies.
In the record, humanities destruction of the other races' habitat forced them to take shelter on the surface. And we owe it to them.
In the record, let's say an odd thing happened like it rained forty days and forty nights over an ancient dried up sea bed and created a lake where none had been for a very long time. Well, that's a good thing, because someone is moving in.
Update - 2018 August 22-23 - grammar